Ask and you shall recieve! (Flip Top Gas cap Adapter)

Wow guys, I have had quite a few more people asking for an early A adapter.
OK to help me out here how "Early" are we talking here?
What is it, 64-66 Barracuda are similar, I think the Darts are similar from 64-66 as well?
So are what all are you hoping for?
By the way!!!
There may be a perk in it for a few select people here, since I dont have all these cars at my disposal. I may need a few owners to get me some incredibly good measurements, and in return I will give an adapter to them.
We will see what I can come up with on my own, if anything then Ill be sure to ask for some help where needed.
Help me solve which cars and what years we are talking about here first.
Also, its possible that it may not be worth the cost if there arent enough people interested in the particular model for a specific adapter. So I also need to know how many people want them and for what car specifically.
Let me know guys. I am on vacation right now and may be able to jump on the design next week sometime.
Lata'!!!!!!